old brass camera lens ?????? dalmeyer ?? dont know 2 3/4" x 5 1/4"

I recently sold a huge dalmeyer lens and just found these as well I dont see a name on this one, I dont know about these or who makes them. some have names some dont (see all the lenses I have listed)
the lenses are look like they need cleaning but I prefer not to. this lens is 5 1/4" (the length of the silver barrel and two lenses on each end) each lens has a # 24 on it (dont know what that means, I dont see any other name on this or i just cant find it.
questions please ask. See my other lenses I have listed..
this auction is for one lens listed.
thanks